Malicious PDF — malware analysis report

Static analysis result for SHA-256 b509d93780d2520f…

MALICIOUS

PDF

91.1 KB Created: 2021-08-06 11:53:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e897014cacf3daf211f6eb4342714bb4 SHA-1: 97cb11e53d57322e25ae3cc5a9fa42eea1fbb367 SHA-256: b509d93780d2520f7463c25e072364c550f5915f24b4f08089cce682a888ca36
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF was flagged by ClamAV as a phishing trojan and the ML classifier returned a high probability of maliciousness. It contains numerous links to external websites, many hosted on compromised WordPress installations or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of a 'download button' heuristic further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://smidgel.ru/uplcv?utm_term=hitman+agent+47+2007+full+movie+download+filmywap PDF link annotation
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0758bcaec4---55144669269.pdfIn PDF document text
    • http://aimic.com/userfiles/file/pasuvujisetejozilo.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608f2b840d3ca---7453691204.pdfIn PDF document text
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/fecc1fef28f44331bd848d1b1fb31d75/94427825239.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/1ddb282f58634c39ea5bc98f5c7139b8/keteropegikefu.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/lewidinolubezavixumiz.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a30ff1ed956---rixizixuwogiditerer.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/bc650b0cff3b96b9d376a3eb5a021307/nudorox.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/8d33c505b6fb6180652cbf3617fef22e/8911203303.pdfIn PDF document text
    • https://ols.lighting/wp-content/plugins/super-forms/uploads/php/files/9358b0929d44b67133ba05cdc4d51b4a/13328568816.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/563bc38da12f393f83a4b38d6a34e1a9/firukitexubemix.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/v6lbc6naef3uc516la5shdi5s2/41255110273.pdfIn PDF document text
    • https://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/3763f3039b6436dfaf7a984060e75b60/86966952775.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/97ea0fcc38587afb9efae0741f2f591c/82886844344.pdfIn PDF document text
    • http://inezorviskids.com/clients/37546/File/doxuluwuvi.pdfIn PDF document text
    • http://unesco-mediain.cz/fckfiles/file/22008637769.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607f5e0517d4b---dinilikekoduzopisebi.pdfIn PDF document text
    • http://rghsalumni.com/clients/82979/File/ratofakibon.pdfIn PDF document text
    • https://noddy.nu/images/file/16881978226.pdfIn PDF document text
    • http://hayatteknoloji.com/webimage/file/5506314561.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/kexekudorepususenidabuk.pdfIn PDF document text
    • http://xn--22cjbbm2eyae3ehabdb4kqdtae3dxnnc1fhf.com/user_img/files/35869466476.pdfIn PDF document text
    • https://galerie-louise.be/userfiles/files/28621770338.pdfIn PDF document text
    • http://maidichike.com/upload/files/josil.pdfIn PDF document text
    • http://musthighschool.mn/ckfinder/userfiles/files/venefokobojuxud.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fe3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE3B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011652.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11652 11300 bytes
SHA-256: 7f692eb072460415ebb0c6a292c0b8be545c6f7a748465919d20e6af1f1bae22
font_02_sfnt_off000130c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130C5 17132 bytes
SHA-256: d833783a0ee94102a871738c20c89bff2251739197a293bd76cc8e87879504e1